Heavy nuclei at the end of the cosmic-ray spectrum?
Heavy nuclei at the end of the cosmic-ray spectrum?
We provide an account of the possible acceleration of iron nuclei up to energies $\ensuremath{\sim}300 \mathrm{EeV}$ in the nearby, metally rich starburst galaxy NGC 253. It is suggested that particles can escape from the nuclear region with energies of $\ensuremath{\sim}{10}^{15} \mathrm{eV}$ and can then be reaccelerated at the terminal shock …